// out: false
.github(@fg, @bg, @urlColor) {
  @fg-strong: contrast(@bg, darken(@fg, 32%), lighten(@fg, 32%));
  @fg-subtle: contrast(@fg, lighten(@fg, 16%), darken(@fg, 16%));
  @border: contrast(@bg, lighten(@bg, 16%), darken(@bg, 16%));
  @blockquote-bg: contrast(@bg, lighten(@bg, 8%), darken(@bg, 6%));
  @margin: 16px;

  body {
    font-family: "Helvetica Neue", Helvetica, "Segoe UI", Arial, freesans, sans-serif;
    // font-size: 1.2em;
    font-size: 16px;
    line-height: 1.6;
    color: @fg;
    background-color: @bg;
    overflow: initial;
    box-sizing: border-box;
    word-wrap: break-word;

    &> :first-child {
      margin-top: 0;
    }

    // Headings --------------------
    h1,
    h2,
    h3,
    h4,
    h5,
    h6 {
      line-height: 1.2;
      margin-top: 1em;
      margin-bottom: @margin;
      color: @fg-strong;
    }

    h1 {
      font-size: 2.25em;
      font-weight: 300;
      padding-bottom: 0.3em;
    }

    h2 {
      font-size: 1.75em;
      font-weight: 400;
      padding-bottom: 0.3em;
    }

    h3 {
      font-size: 1.5em;
      font-weight: 500;
    }

    h4 {
      font-size: 1.25em;
      font-weight: 600;
    }

    h5 {
      font-size: 1.1em;
      font-weight: 600;
    }

    h6 {
      font-size: 1.0em;
      font-weight: 600;
    }

    h1,
    h2,
    h3,
    h4,
    h5 {
      font-weight: 600;
    }

    h5 {
      font-size: 1em;
    }

    h6 {
      color: @fg-subtle;
    }

    /*
    h1, h2 {
      border-bottom: 1px solid @border;
    }
    */

    // Emphasis --------------------

    strong {
      color: @fg-strong;
    }

    del {
      color: @fg-subtle;
    }


    // Link --------------------
    a:not([href]) {
      color: inherit;
      text-decoration: none;
    }

    a {
      // color: #08c;
      color: @urlColor;
      text-decoration: none;
    }

    a:hover {
      // color: #0050a3;
      color: contrast(@urlColor, lighten(@urlColor, 8%), darken(@urlColor, 6%));
      text-decoration: none;
    }


    // Images --------------------
    img {
      max-width: 100%;
    }


    // Paragraph --------------------

    &>p {
      margin-top: 0;
      margin-bottom: @margin;
      word-wrap: break-word;
    }

    // List --------------------

    &>ul,
    &>ol {
      margin-bottom: @margin;
    }

    ul,
    ol {
      padding-left: 2em;

      &.no-list {
        padding: 0;
        list-style-type: none;
      }
    }

    ul ul,
    ul ol,
    ol ol,
    ol ul {
      margin-top: 0;
      margin-bottom: 0;
    }

    li {
      margin-bottom: 0;

      &.task-list-item {
        list-style: none;
      }
    }


    li>p {
      // margin-top: @margin;
      margin-top: 0;
      margin-bottom: 0;
    }

    .task-list-item-checkbox {
      margin: 0 0.2em 0.25em -1.8em;
      vertical-align: middle;

      &:hover {
        cursor: pointer;
      }
    }


    // Blockquotes --------------------

    blockquote {
      margin: @margin 0;
      font-size: inherit;
      padding: 0 15px;
      color: @fg-subtle;
      background-color: @blockquote-bg;
      border-left: 4px solid @border;

      > :first-child {
        margin-top: 0;
      }

      > :last-child {
        margin-bottom: 0;
      }
    }

    // HR --------------------
    hr {
      height: 4px;
      margin: @margin*2 0;
      background-color: @border;
      border: 0 none;
    }

    // Table --------------------
    table {
      margin: 10px 0 15px 0;
      border-collapse: collapse;
      border-spacing: 0;

      display: block;
      width: 100%;
      overflow: auto;
      word-break: normal;
      word-break: keep-all;

      th {
        font-weight: bold;
        color: @fg-strong;
      }

      td,
      th {
        border: 1px solid @border;
        padding: 6px 13px;
      }
    }

    // Definition List
    dl {
      padding: 0;

      dt {
        padding: 0;
        margin-top: 16px;
        font-size: 1em;
        font-style: italic;
        font-weight: bold;
      }

      dd {
        padding: 0 16px;
        margin-bottom: 16px;
      }
    }

    // Code --------------------
    code {
      font-family: Menlo, Monaco, Consolas, 'Courier New', monospace;
      font-size: 0.85em !important;
      color: @fg-strong;
      background-color: contrast(@bg, lighten(@bg, 8%), darken(@bg, 6%));
      border-radius: 3px;
      padding: 0.2em 0;

      &::before,
      &::after {
        letter-spacing: -0.2em;
        content: "\00a0";
      }
    }

    // YIYI add this
    // Code tags within code blocks (<pre>s)
    pre>code {
      padding: 0;
      margin: 0;
      font-size: 0.85em !important;
      word-break: normal;
      white-space: pre;
      background: transparent;
      border: 0;
    }

    .highlight {
      margin-bottom: @margin;
    }

    .highlight pre,
    pre {
      // font-family: Menlo, Monaco, Consolas, 'Courier New', monospace;
      padding: 1em;
      overflow: auto;
      font-size: 0.85em !important;
      line-height: 1.45;

      // color: @fg;
      // background-color: contrast(@bg, lighten(@bg, 4%), darken(@bg, 6%)) !important;

      border: @border;
      border-radius: 3px;
    }

    .highlight pre {
      margin-bottom: 0;
      word-break: normal;
    }

    /*
    pre {
      word-wrap: break-word;
      white-space: normal;
      word-break: break-all;

      .section {
        opacity: 1;
      }
    }
    */

    pre code,
    pre tt {
      display: inline;
      max-width: initial;
      padding: 0;
      margin: 0;
      overflow: initial;
      line-height: inherit;
      word-wrap: normal;
      background-color: transparent;
      border: 0;

      &:before,
      &:after {
        content: normal;
      }
    }

    p,
    blockquote,
    ul,
    ol,
    dl,
    pre {
      margin-top: 0;
      margin-bottom: @margin;
      // word-wrap: break-word;
    }

    // KBD --------------------
    kbd {
      color: @fg-strong;
      border: 1px solid @border;
      border-bottom: 2px solid darken(@border, 6%);
      padding: 2px 4px;
      background-color: contrast(@bg, lighten(@bg, 8%), darken(@bg, 6%));
      border-radius: 3px;
      // box-shadow: inset 0 -1px 0 #bbb;
    }

    // very nice tutorial & intro
    // https://www.smashingmagazine.com/2015/01/designing-for-print-with-css/
    @media print {
      background-color: @bg;

      h1,
      h2,
      h3,
      h4,
      h5,
      h6 {
        color: @fg-strong;
        page-break-after: avoid;
      }

      blockquote {
        color: @fg-subtle;
      }

      /*table,*/
      pre {
        page-break-inside: avoid;
      }

      table {
        display: table;
      }

      img {
        display: block;
        max-width: 100%;
        max-height: 100%;
      }

      pre,
      code {
        word-wrap: break-word;
        white-space: pre;
      }
    }
  }
}